<PLEASE HELP> BIG Problem with Yamaha YPG-635 and Driver... <PLEASE HELP>

I hope someone can help me out with this. I just got a Yamaha YPG-635 to use for a big project. Upon finding out it didn't use a standard MIDI-I/O, I switched to that wierd printer cable thing.
So I'm using Windows 7 64x Bit. I have yet to install the drivers (32 bit or 64 bit), because my problem is that when I plug the keyboard into my computer, it doesn't give me a dialouge, no Windows Driver things like it should, nothing. Should I uninstall the installed MIDI drivers? I really don't know what to do.
This is a REALLY big project, and this is the only keyboard we have a available, so if anyone could PLEASE help, I, or rather, WE would be very greatful. Thank you!

weird printer cable thing?  what in the world is that?

the YPG-635 uses a USB connection for MIDI.  plug a USB cable into the YPG-635 and the computer.  actually - you should read the manual first because it will tell you if you should install the drivers first or if you should plug it in first - likely you install the drivers first, but not always.

Thanks for the quick reply, Beagle.

I searched a lot through the manual ( I don't actually own this, and it didn't come with the original install disc) for the driver installation stuff, and I also step-by-step followed the driver installation-specific manual, both of which come to null. I've tried both versions of the driver for either OS (as I said earlier), plus I rebooted after removing every USB device besides the mouse, keyboard and instrument itself.

I guess I'd be better off talking to the pros and stuff over at some Yamaha forum; I just figured it'd be quicker if I didn't have to go through the installation process for one question.